Traditional Chinese Rice Noodles: History, Classification, and ...
嚜燜raditional Chinese Rice Noodles:
History, Classification, and
Processing Methods
Y. Li, J.-F. Liang, M.-Y. Yang,
J.-Y. Chen, and B.-Z. Han1
Beijing Laboratory for Food
Quality and Safety,
College of Food Science
and Nutritional Engineering, China Agricultural University
Beijing, China
R
ice is a main staple in the
Asian diet that has many
unique attributes, including
ease of digestion, a mild flavor,
and hypoallergenic properties
(9). China is the largest producer and consumer of rice in the
world, with an average per capita consumption of 102 kg of
rice-based food products (11). The main rice variety used for
rice noodles is indica, which is widely cultivated in south China
for its high yield and adaptability to local weather conditions.
Indica is more suitable for rice noodle applications than japonica
because it contains more amylose (14).
Rice noodles, also called mifen, mixian, hefen, or mimian, are
a popular and traditional food in China. Processing procedures
used to make traditional Chinese rice noodles include soaking,
grinding, heating (steaming or boiling), molding (extruding or
cutting), cooling, and drying (13).
Rice noodles originated during the Qin dynasty (259每210 b.c.)
and have been consumed for more than 2,000 years in China.
Historical records suggest that when people from northern
China invaded the south, they preferred noodles made from
wheat flour because they were not accustomed to eating rice.
To adapt, northern cooks tried to prepare ※noodles§ using rice,
thus inventing rice noodles. Over time rice noodles and their
processing methods have been introduced around the world,
becoming especially popular in Southeast Asia (13).
Their ease of preparation and diverse flavors have made rice
noodles popular both in home-cooked foods and in restaurants
in southern China for many years. Thanks to the development
of rice noodle production and distribution industries people
around the world can now enjoy rice noodles (4).
Today, rice noodles are served as both a food staple and as a
side dish. They may be mixed with meats and vegetables and
stir-fried or boiled in broth and served as soup noodles (6).
Methods used to produce traditional Chinese food have not
1 Corresponding author. Bei-Zhong Han, China Agricultural University, P.O. Box 398, No. 17
Qinghua E Rd, Beijing 100083, China. E-mail address: hbz@cau.; Tel/Fax: 86-10-62737078.
?2015 AACC International, Inc.
been systematically reported;
therefore, this article reviews
the classification and processing of rice noodles to better
understand this traditional
Chinese food.
Classification of Chinese
Rice Noodles
There are various types
of rice noodles available in
the market. The most wellknown products are from the
provinces of southern China,
such as Jiangxi, Guangdong,
Guangxi, Yunnan, and Hunan.
Influenced by the districts in
which they are produced, special manufacturing processes, cultures, and historical backgrounds, different types of rice noodles
have acquired characteristics specific to their geographic origins. Jiangxi-mifen, Guangzhou shahe-fen, Guilin-mifen, Yunnan
guoqiao-mixian, and Changde-mifen are examples of typical
local products that are classified based on the district in which
they are produced and the manufacturing process used. Chinese
rice noodles are further categorized based on their shape, which
is affected by the molding method used, and moisture content.
Classification Based on Molding Method. The most important classification criterion is the method used to mold rice
noodles. There are three major molding methods:
1) Cutting noodles (termed qiefen in Chinese). Steamed rice
noodle sheets are cut into rectangles that are 1 mm thick,
4每6 mm wide, and >200 mm long. Representative products include bianfen, qiefen, and Shahe-fen.
Extruding noodles (termed zhafen in Chinese). Steamed
rice paste is extruded into strips using different molds.
The length of the strips is >200每400 mm, while the diameter ranges from 1 to 3 mm. Representative products include guoqiao-mixian, Guilin-mifen, Changde-mifen, and
fenli. Fenli is a special type of extruded rice noodle with a
shorter length and larger diameter.
2) Spreading and rolling noodles (termed changfen in Chinese). Rice noodle wrappers containing various fillings
are rolled. Changfen is a representative product.
The three major classifications of rice noodles based on molding method are described in Table I. Major rice noodle products
are illustrated in Figure 1.
Classification Based on Moisture Content. Moisture content affects the shelf life of a product, as well as how the rice
noodle is consumed. Chinese rice noodles are classified into
two groups based on moisture content: dehydrated and fresh
CEREAL FOODS WORLD / 123
(Table I). The moisture content of dehydrated products is >15每
25%, whereas the moisture content of fresh products is 40每65%
(3,10). Moisture content is also the main factor that affects the
flavor and quality of rice noodles.
Two different types of drying equipment, a continuous drying
cabinet or a drying room, are widely used. Noodles are dehydrated to prolong shelf life, which can be extended for as long as
2 years. Fresh noodles that have not been dehydrated are thought
to have a smoother and more delicate flavor, and they generally
are more convenient for consumers.
Processing Chinese Rice Noodles
Currently, most rice noodles are produced by machines similar to those used to make traditional handmade rice noodles.
Although the production process used for a particular type of
rice noodle may differ from region to region to meet local needs,
the basic principles are generally the same.
There are several major steps in processing raw rice into rice
noodles. The procedure consists of selecting raw rice, followed
by cleaning, soaking, grinding, heating (steaming or boiling),
molding (extruding or cutting), and cooling (and drying). The
major processing steps for manufacturing different kinds of rice
noodles are diagrammed in Figure 2.
Selection of Raw Rice. Rice noodles are made with milled
rice grain, and almost all of their components, such as starches,
proteins, lipids, low molecular weight sugars, and ash, affect the
consistency of the noodles. Studies have shown that raw rice
with high amylose and protein contents produce high-quality
rice noodles (5). Traditionally, the variety indica is used in rice
noodle formulations. Indica rice can be categorized as early- or
late-harvest, depending on when the rice is harvested during
the growing season. Compared to early-harvest cultivars, late-
Fig. 1. Common types of rice noodles: A, fresh qiefen; B, dehydrated
qiefen; C, fresh zhafen; D, dehydrated zhafen; E, fenli; F, changfen.
124 / MAY每JUNE 2015, VOL. 60, NO. 3
harvest rice has a lower production yield and is less expensive
and stickier (12). Although early-harvest rice is the main rice
used in rice noodle formulations, it is more economical to use
late-harvest rice. Taking price and quality into consideration, a
mixture of early- and late-harvest indica rice is often used to
produce noodles. Different early- and late-harvest rice ratios
have been used: for example, 1:0.25 to 1:0.67 (20), 7:3 (2), and
1:1.5 (7).
Cleaning Raw Rice. Procedures for cleaning raw rice are
essential for removing dust and other foreign materials.
Soaking. The length of time the rice is soaked can range
from several hours (short time) to several days (long time) and
depends on whether the end product will be unfermented or
fermented rice noodles, respectively. Natural fermentation
occurs after rice has soaked for a long time.
The purpose of soaking for a short time is to allow water to
penetrate into the rice kernel, which results in a high moisture
content and less rigid structure without initiating fermentation.
It takes 2每3 hr in summer and 4每5 hr in winter for the moisture
content to reach 26每30% at room temperature (1).
Soaking rice for a long time is essential for producing naturally fermented rice noodles. During this procedure, rice is
soaked not only to absorb water, but also to allow natural fermentation to occur. Normally, this process takes 2每3 days in
summer and 4每5 days in winter. Fermentation is facilitated by
various microbes, especially lactic acid bacteria (LAB) and
yeasts (12). Fresh rice noodles made from fermented indica rice
have a unique texture and consistency compared with fresh
noodles made from rice that has been soaked for only a short
time (8,15,17,21).
The effect of LAB and other bacteria during fermentation is
a decrease in pH. The rice and soaking water have an initial
pH of 7 (neutral), and this decreases to a pH of 4 when fermentation is complete. In a study by Lu et al. (16), the pH of the supernatant decreased to 4.2 after 24 hr and remained constant
at a pH of 4.1. The main organic acids in the supernatant were
lactic acid and acetic acid. Lactic acid was predominant, indicating that some of the LAB involved were heterofermentative
(16). It has also been reported that fermentation plays an important role in improving the nutritional content, flavor, and
texture of rice noodles (18).
Grinding and Sieving. Once soaked rice achieves the appropriate moisture content, it is ground and then sieved (only after
dry grinding). Two different grinding methods are used: dry
and wet.
Dry Grinding. A hammer mill is widely used for dry-grinding soaked rice. When ground to the proper size, rice particles
can pass through 60 or 80 mesh sieves. Typically, rice soaked for
a short time is suitable for dry grinding, whereas dry-grinding
rice with higher moisture levels (>26每28%) may lead to rice
agglomeration or plugging of the mesh sieve (19).
Wet Grinding. A wheeled grinder is widely used for wetgrinding rice, during which water is added. Rice soaked for a
long time, which has a moisture content of >45%, is suitable for
wet grinding. Wet grinding produces a rice slurry with a smooth
consistency.
Molding. Molding, or the process of shaping ground rice, is
categorized by two methods: extrusion and cutting.
Extruding Rice Noodles (Zhafen). Extrusion is an important molding method that produces rice noodles with a rounded shape. Rice slurry is first transported by a band carrier in
sheets that are >5 mm thick. The sheets are then presteamed for
4每5 min at 90∼C. Finally, the steamed sheets are extruded into
rice noodles and boiled to ensure they have completely gelatinized.
Extruders are relatively simple to operate and can perform
heating and molding simultaneously. Materials are continuously
fed into the machine, and after heating to the proper temperature, they are extruded into noodles. The size and shape of extruded rice noodles can be adjusted to meet the specifications of
the end product.
Cutting Rice Noodles (Qiefen). Rice noodles can also be cut
into appropriate shapes. Before cutting, ground rice must undergo two heating procedures. First, a portion of the ground
rice (>20每30%) is presteamed, after which the remainder of the
ground rice is added to make a thick rice slurry that is formed
into 1每3 mm thick sheets. The sheets are then fully steamed, and
band carriers transport the steamed rice sheets to be cut into
rectangular noodles.
Heating (Steaming or Boiling). The purpose of heating is to
completely gelatinize the starch in the rice to its a-state. Heating
occurs in two steps: steaming, which is performed before molding, followed by boiling.
Steaming pregelatinizes rice noodles and is performed in two
types of pressurized cabinets: common pressure or high pressure (>0.05每0.06 MPa) (19). Common-pressure steaming under
normal air pressure takes more time than high-pressure steaming. High-pressure steaming under higher pressure and temperatures (>100∼C) also is faster (20) than low-pressure steaming. In
high-pressure steaming, noodles are steamed continuously in a
tunnel for 3 min. The noodles are then boiled at 98∼C for 1每2 min,
at which point the rice noodles are completely gelatinized. Heating temperature and time must be strictly controlled to avoid
excessive gelatinization.
Cooling. Cooling involves placing steamed or boiled rice
noodles in cool water (0每10∼C) to rapidly decrease their temperature to 24每26∼C and form a stronger gel. The cooling procedure facilitates noodle separation and creates a smooth, slippery noodle texture. This step takes >1.5每2.5 min.
Staling. After steaming, noodles undergo a staling process.
Steamed, gelatinized rice noodles are aired in a special room
for 12每24 hr to convert starches to their b-state. This produces noodles with a nonsticky, stable structure and increased
flexibility. Noodles are carded at this stage so they do not
overlap.
Dehydrating. To prolong their shelf life, rice noodles may be
dehydrated to a low moisture content. Drying decreases the
moisture content of rice noodles from 40每65% to 15每25%. To
dehydrate noodles, two types of equipment are widely used: a
continuous drying cabinet and a drying room.
In a continuous drying cabinet indirect steam is used for heat
exchange〞heat is exchanged between the heated steam and air
in the cabinet. To achieve satisfactory quality, rice noodles should
be turned over manually one or two times during drying.
Fig. 2. Primary processing steps in the production of different types of
rice noodles.
CEREAL FOODS WORLD / 125
A drying room is another widely used system for dehydrating rice noodles. A temperature and moisture gradient is used
to treat rice noodles throughout the drying process. Although
drying at low-temperatures ( ................
................
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